Power unit for food processors



April 3, 1945. A. sTRAuss ETAL POWER UNIT .FOR FOOD PROCESSORS originalFiled Jan. 8, 1940 4 Sheets-Sheet 1 April 3, 1945. AQSTRAUSS ETAL2,372,862

POWER UNIT FOR FOOD PROCESSORS Original Filed Jan. 8, 1940 4Sheets-Sheet 2 Inventor-s Alfred Strauss Eric G. Feltman Melville M.Hunt W D. H

April 3, 1945.

Original Filed Jan. 8, 1940 4 Sheets-Sheet 3 Alf'r'ed Strauss MelvilleM. Hunt son D r-b u BY heir ALlor-n ev April 3, 1945. A. sTRAUss Erm.2,372,862

POWER UNIT FOR FOOD PROCESSORS Original Filed Jan. 8, 1940 4Sheets-Sheet 4 nvenltors Alfred Strauss 97 V S6 Epic G, Fetrnon Melville[VL Hunt Byjbson D Hrbq f Patented Apr. 3, 1945 2,372,502 Powaa unir FoaFoon Paocassoas Alfred Strauss and Eric G. Feltman, Melville M. Hunt,Park Ridge, and

Chicago, Watson D.

Harbaugh, Evanston, Ill., asaignora to A. F. Dormeyer Mfg. Co., acorporation of Illinois Original application January 8, 1944i, SerialNo.

312,874. Divided and this application February 18, 1942, Serial No.431,588

16 Claims.`

The present invention relates to food processing devices and moreparticularly to food mixers, liqueners and juice extractors.

This application is a division of our application, Serial N0. 312,874,tiled January 8, 1940, for Food processor, reference to which is herebymade for a fuller understanding of the general construction of the foodmixer.

It has been the practice to build food processing devices of the classdescribed with the motor casing and the beater and beater drive assemblyfashioned as a single unit. Although this has many advantages evidencedalmost without exception, by the many mixers upon the market, theadvantage of lifting the motor from the standard for mixing food at apoint remote from the mixer base, entails the lifting and handling of aheavy article which is very tiresome. In the present invention only theweight of the gear housing is encountered for this purpose. The gearcasing can be separated as a unit from the heavy motor parts andconstitutes the only part that has to be lifted and handled for remotemixing.

In accomplishing this, we prefer to provide a detachable flexible driveinterconnecting the motor and the movable bart. By providing thedetachable drive, other tools, such as wood carvers, buffers, silverpolishers and grinding wheels may be substituted for the beaters uponthe beater gear housing or be connected directly to the flexible drivewithout the housing and other types of food processing units can bedriven direct from the motor interchangeably with the housing and theflexible drive. In such instances supports may be provided for the toolsor gear housing if they are to be stationary, and, if not, the selectedtools may be suitably conformed so that they can be easily handled inoperation.

In the present invention, we provide a means for automaticallyreciprocating the beaters in a bowl from one side of the bowl to theother vcontinuously through any adjusted distance at a slow rate,whereby the bowl will be rotated several turns in one direction andbefore it has a chance to attain a dangerous speed, move the beatersnear the other side for a brief period and cause the bowl to rotate inthe opposite direction, in the meantime passing the beaters back andforth over the center of the bowl to remove any collection of unmixedingredients that generally collect at the center of large bowls outsideof the sweep of revolving fixed beaters.

Moreover, very often the motor would not be turned off when the beaterswere raised. As a result, the mixture clinging to the beaters would bewhirled and splattered over everything nearby. It is the intention ofthe invention to prevent this happening. In doing this, we stop themotor automatically when the beaters are raised a certain distance andstart the motor again automatically when it is lowered past apredetermined level.

Another object of the invention is to provide an improved mounting for amotor wherein vibrations induced by a detachable gear housing aredampened and vibrations induced by the motor are transmitted to adetachable liquefying container to assist in the circulation of solidobjects in the container.

Another object of the invention is to provide an improved motor unitinterchangeable with different attachments including a motor casingwhich is cooled in an improved manner without transmitting heat to theattachments and gear housing.

Another object of the invention is to provide an improved arrangementbetween a motor developing heat in its operation and a gearing unitwherein the heat and lubricant; viscosity in the gear housing ispractically unaffected by heat developed' in the motor.

Another object is to provide an improved speed governor and brushmounting for an electric motor` and an improved blower having minimizednoise characteristics at high speed for cooling the motor parts.

Another object is to provide an improved motor unit, an improved gearhousing, an improved liqueer, and an improved interchangeablerelationship between the gear housing, the liqueiier and the motor unit.

Another object of the invention is to provide an improved circuitinterrupter speed control governor and control therefor which can beused in connection with a food liqueer.

Another object of the invention is to provide an improved driveconnection which may be disengaged and engaged at will without anyattention to pre-alignment, and with a wide tolerance for out ofalignment conditions which might arise due to the manufacture ofheterogeneously fitting parts and interchangeability.

Another object is to provide an improved power unit for food processingdevices that is provided with self-aligning bearings at both ends of theshaft.

Another object of the invention is to provide a powered food mixerhaving a ,low center of gravity and a greater stability against beingupset or knocked over. l

Another object of the invention is to provide a. food processing devicewhich is simple and rugged in its construction, eflicient in its purposeand use,

inexpensive to manufacture and easily operated and adjusted by personsinexperienced mechanically.

These being among the objects of the present invention, other andfurther objects will become apparent from the drawings. the descriptionrelating thereto and the appended claims.

Referring now to the drawings:

Fig. 1 is a side elevation of an embodiment of the inventionillustrating, partly in broken lines, two different positions thebeaters may be disposed in when the embodiment illustrated is placed inuse;

Fig. 2 is a vertical section through the power unit tak'en upon the line2-2 in Fig. l;

' Fig. 3 is a horizontal section through the universal coupling betweenthe gear housing and the motor unit as taken upon the line 3 3 in Fig.2: Y

Fig. 4 is a vertical section taken through the power unit and a portionof the gear housing upon a plane running longitudinally with the gearhousing as indicated by the line l-i in Fig. 2;

Fig. 5 is a horizontal section through the power unit near thetopthereof as taken upon the line 5 5 in Fig. 4;

Fig. 6 is a horizontal section through the power unit as taken upon theline `6-t in Fig.

Fig. 7 is a vertical section through a liquefier attachment for thepower unit taken upon a vertical plane coinciding with the axis or thepower unit.

In the present invention a food mixer is provided in which a base 3@ hasmounted at one end thereof a turntable 3i supporting a bowl 32 thereon,and, at its other end, an upright power unit 3S supporting at the topthereof a gear housing 36 carrying depending beaters S6 which extenddown into the bowl 32 when the gear housing 3d is in its loweredposition as indicated by the numeral 3l, as distinguished from itsraised position as indicated at @t in broken lines. A handle formanaging the gear housing is shown at 36.

As best shown in Figs. 2 and 4, the base Elli constitutes a die castmetal unit having downwardly depending iianges lil with bosses liltherein to receive rubber feet lit? that are secured thereto by machinescrews 33. The base 3@ is webbed,

as at lli, over the lower face thereof for structural rigidity, and atthe front end is provided with a rearned boss (not shown) to journal thespindle i5 of the turntable 3 i.

At its rear end the base is provided with an integral ring tit,preferably concentric with the housing El? of the power unit. The ring55 provides an opening d8 large enough for the free exhaust of airtherethrough employed in cooling the motor parts, and also to provideroom enough to receive certain parts of the motor assembly for the sakeof compactness. Diametrically opposite each other on the ring twodrilled and threaded holes 5u are provided to receive the verticalassembly bolts `5i which hold the elements of the power unit together asan assembly and also secure the unit to the base. The p ower unit 33comprises a die-cast part having a shell d1 of a curvilinear, upwardlytapering contour which is open at the lower end, where the marginal edge52 is staggered to provide openings 54 when the 'ill downwardly as ribsor fins 6| integrally therein as a part of the inner edges of the iinsGB.

The boss 58 is bored to receive, in supported relationship, a selfaligning bearing comprising a washer 63 resting upon a shoulder B4-atthe bottom of the boss and a bearing member 65 held in universalengagement with the washer 63 by a spring 6'3 placed under tension by acollar 51 threaded into the upper end of the boss 58.

An annulus 62 is cast integrally with the inner edges of the iins Si andthe annulus 62 is reamed to receive the stator 88 of the motor aslimited by a shoulder 10 left in the reaming operation near the upperend of the annulus E2 at a place to locate the stator a predetermineddistance from the end wall 55.

It will be seen from the description thus far that the stator 68 wheniit into the ring @2 is brought into heat transfer Contact therewithwhereby heat developing in the stator is conducted directly to thereinforcing fins '8l and ribs dii. The inner contour il of the shell 4iis formed to provide a streamlined passageway for air owing in throughthe opening 5t and upwardly over the ilns 6l to the top of the shell.From vthere the air passes radially inwardly with full freedom ofmovement over the upper endl of the ring @2 where it is driven by thefan i2 mounted upon the armature shaft 73, downwardly and centrallythrough the stator @t and outwardly to the outside again through theopenings d8. At no time is the air stream in a position to contaminatefood in the bowl and the air is in contact with the outside of theheated parts as well as passing through them.

At its lower end 52 the shell il is supported upon an intermediatemember 'ifi comprising a `plate circumierentially shouldered at 'l5 tore- The bearing boss il is reamed out from the bottom to leave ashoulder it at the top thereof which receives a compression spring t@which holds bearing di in universal engagement with a plug 82 threadedas at E33 into the bearing boss Tl. i

In addition to supporting the bearing di the plug 32 supports, inadjustable relation, a ball end-thrust bearing 84 for the shaft i3.

'I'he intermediate member 14 is in turn supported upon a shoulderedwasher S5 made of live rubber, which dampens the transmittance of allsound and vibration to the base 3d from the intermediate members i4including the shell M.

'I'he washer 85 is prevented from slipping sidewise by a shoulder B6formed as a part of a recess 'l into which the washer is pressed uponthe upper surface of the base 39.

It has already been mentioned that the bolts ning to the brackets 93.

5| secure the shell 41 to the base 30. It is upon these bolts that theremaining motor parts, other than the amature, are supported as a unitand held in spaced relation by sleeves 86 and 88.

'Ihis unit comprises an improved brush governor unit made up of apressed plate 90 composed of electrical insulating material which isapertured as at 9| to receive the bolts 5| and upon which the otherparts are mounted.

As more particularly shown in Fig. 6 the -plate 90 is circular with alarge central aperture 92 to permit free circulation of airtherethrough. Upon the upper side of the plate 90 at diametricallyopposed points, U-shaped brackets 93 secure brush holders 94 in place byfingers 95 extending through the plate where bent overpor- `tions uponthe lower side thereof clinch the brackets and holders in place. 'I'hebrush holders 94 are tubular, being preferably made of brass with anirregular outer contour preventing their turning when held by thebrackets 93, The tubes 94 extend to the wall of the shell 41 whereapertures 96 are provided to receive kurfed Bakelite caps 91. The caps91 removably support brass disks 98 at the outer ends of the tubes wherethe disks provide an electrical contact between the tube 94 and thecompression springs |0| which Contact and hold the brushes against thecommutator |02. Electrical connections in the motor circuit are madethrough leads run- This construction provides for a ready assembly andremoval for the installation and repair of the brushes. y

Upon the lower side of the -plate 90 the parts of the circuit breakingcentrifugalv governor are mounted. The movable contact |03 thereof (seeFig. 4) is mounted upon a spring bar |04, which is apertured as at toencompass the shaft 13 and is securedl to the plate 90 as by riveting|06.

The contact bar |04 is moved back land forth in response to variationsin the motor speed by centrifugal weights |01 pivotally mounted at |08upon a plate ||0 presstted or secured against the commutator |02. 'I'hecentrifugal weights |01 are all shaped with a bell crank end portionpressing against an axially movable disk ||2 having a ball bearingengagement with a follower I3 keyed against rotation by fingers |4 uponthe contact bar |04. The train of elements just described are collapsedagainst the exercise of the centrifugal force mentioned by means of acompression spring I5 between the bar |04 and the bearing boss 11.

Beneath the contact |03 and cooperating therewith is a manually movablecontact H6. The contact H0 is mounted upon a bell-crank ||1 by a pivotpin H8, carrying a torsion spring |20 urging the contact H6 toward thecontact |03. I'he limit of movement permitted the contact H6. and itsadjustment is accomplished by means of a' coarsely threaded shaft 2|extending through the wall of the shell 41, where it receives a handle|22 with an indicator |23 thereon. The shaft |2| and the pivot pin H8are supported in a single metal stamping |24, riveted, as at |25` to theupper face of the plate 90.

The brush governor assembly thus described is neat and compact, the unitis readily assembled outside of the motor housing, and easily placed inthe motor housing between the sleeves 88 before the bolts 5| areinserted in place, one cap 19 being inserted through one opening 96before the other cap is raised to position, it being optional whether.the brushes are assembled before or afterward.

In assembling the motor unit the casing or shell 41 is turned bottomside up after the self-aligning bearing is assembled and secured inplace. The bolts 5| are then inserted upwardly through cylindricalbosses |26 integral with the end wall 55. Adjacent the heads |21 of thebolts cylindrical rubber sleeves |28 are provided to fit in an enlargedrecess |30 in the bosses |26. The sleeves are flangedradially, as at|3l, to provide a vibration dampening washer-like member ntting snuglybetween the head |21 of the bolt and the upper face of the end wall 55.The opening |32 in the boss |26 below the washer |28 is .widened toreceive the bolt with a wide clearance so as to prevent metal to metalcontact at this point.

Thestator 68 is then inserted in place and comes to rest against theends |33 of the bosses |26 and the shoulder 10. The armature 13 is thenlowered into place with the upper end lowered through the self aligningbearing 65,

' The upper sleeves 88 are slipped in place to act as spacers for thebrush-governor unit, and after the governor unit is located in place,the lower sleeves 88 are slipped over the ends of the bolts 5|. air owcontrol sleeves |34 being located upon opposite sides of the unit toprevent recirculation of cooling air inside the shell 41.

Thereafter the spider 14 is disposed in place; the vibration dampeningwasher 85 assembled therewith, and the base 30 inserted to mate with therubber washer 85 where it receives, in threaded relation. the threadedends of the bolts 5|.

After the. bolts 5| have been tightened the motor unit and base areturned right side up to receive preferably the male member |36 of aquadrate universal joint.

The member |38 drives a female member |43 carried by the gear casing 34which mates with the member |36 with adequate radial clearances |40 toallow for misalignment of the supporting shafts normally expected tooccur in the manufactoring tolerances of the two parts (Fig. 3). Theradial faces |38 upon the teeth of the male member face i'n thedirection of rotation and the radial faces |92 upon the female memberface in the opposite direction to be driven by the first.

Although any number of faces may be provided, it is preferable to havefour disposed at right angles to each other. In this way the universalaction developed by an Oldham coupling is made available in a new andnovel manner in food I mixers. The faces mating between the members atall times permit free slippage radially without a binding that wouldinterfere with the free movement required. Moreover the contour of theteeth as provided is such that the male and female members may beseparated and brought together with minimum interference in making thedrive joint. 'Ihe taper of the bevel is so designed in relation to theradial dimensions of tive face that they permit arcuate engagement anddisengagement with immediate mating without interference between themembers as they are moved relative to each other.

The cavity 51 in the top of the motor housing 41 is provided with ablock |44 disposed at the rear thereof flush with the top 56 where it isheld in place by screws |45 threaded into the wall ofl the cavity at|46. This block provides an anchorage for an outwardly extending lip |41provided upona collar |48. The radial contour of this element is attenedat the sides |50 to permit inclined downward and rearward insertions ofthe lip i |41 under the block |44 with minimum tilt.

At its front side the collar |48 is drilled out as at where it receivesa snap latch |52 reciprocally mounted in a radial bore |53 disposed inthe front of the wall of the cavity 51. The latch comprises a reducedintermediate portion idd over which an inwardly flanged sleeve |55 isslipped with an expansion spring |56 acting between a ange |51 upon thesleeve and a shoulder 55d upon the latch to force the latch inwardly.

The latch is controlled by a handle |59 swagged upon the outer endthereof after lthe sleeve and spring are assembled. The sleeve fitstightly in the bore and thereby holds the latch in latching positionwhen once assembled in place. In this way the collar is locked in placein the cavity 5l.

The inside contour of the collar |48 comprises an inwardly extendingflange |60 Providing upper and lower bearing surfaces and |62respectively grooved as at |63 to receive lubricant.

These bearing surfaces support, against axial displacement and tilting,a head |54 following the contour of the upper surface |S| and innersurface of the flange |60 with a retaining ring |85 resting against thelower face |62 Where it is held against the head |64 by means of screws|66.

Thus, whenever the collar is inserted into and secured in the cavity asby the latch |52, the head is rotatable with respect to the motor unit.

Without describing the gear housing in detailA it may be well at thistime to point out that the head |48 is provided with an Varcuate slot|`l|2 whichreceives a pin |13. The pin |13 is reciprocally mounted inthe collar andl urged by a spring |14 to an upper limit where the pinextends above tle head. When the gear housing is lowered against theupper end of the pin, the pin is driven downwardly. The lower end of thepin controls a normally open switch Whose one pole assists the 'spring|14 in urging the pin upwardly. The switch |16 is connected in the motorcircuit to stop the motor whenever the switch is open.

With this construction, vwhenever the gear rousing is raised, such aswhen it becomes desirable to remove the beaters from the bowl, the motoris stopped, preferably before the universal joint |36 is broken. ThisPrevents motors, such as the series wound motor, preferably used in theembodiment, from running without a load and stops the beaters. When thebeaters are lowered again the universal joint is engaged before theswitch is closed. Thus, themotor never runs without some load, and, as afurther advantage, the make and break switch prevents the food mixture,clinging to the beaters, from being thrown out over the edge of the bowlas the beatvers leave the level of the liquid in the bowl when thebeater housing is raised. This obviates dangers conventionallyexperienced with mixers which are not shut off when the housewife tiltsthe beaters to remove them from the bowl.

Whenever it is desirable to attach the transmission to the motor, theshoulder |41 is inserted under the lug |44 and the front end lowered inplace to dispose the beaters either in the center or at the side of thebowl. If the latch does not snap home immediately a slight oscillationof the transmission will cause the latch to seek the opening nearest toit, after which the transmission will be held rigidly in that position.

To raise and lower the beaters of this embodi- 'ment with respect to thebowl a spring support spring |10 is preferably formed with an arc of agreater radius than the distance between the lower part thereof `and thepintle of the hinge |61. At a predetermined point, a shoulder 312 isprovided on the spring |10 to engage with the shoulder Slupon the baseplate to hold (see Fig. i) the gear housing in-raised position with thebeaters as shown at when the housing has been pivoted upwardly above thehinge |51. A reverse bend 81B at the upper end of the spring has adownwardly facing shoulder i315 thereon which engages with the shoulderi316 upon the base plate to prevent too wide a pivotal movement of thetransmission.

Release of the spring |10 is had by a lever 38o pivoted as at 88| andprovided with a handle 332 arranged so that when the handle is movedrearwardly the shoulder 812 is forced from contact with the shoulder313.

Although certain preferred embodiments of the invention have been shownand described herein, it will be apparent to those skilled in the artthat various uses, modiiications and changes may be made therein withoutdeparting from the spirit and substance of the invention, the scope ofwhich is commensurate with theappended claims.

Whatisclaimedls:

1. In a mixing device, a motor and housing, an agitator supportingmember engaging the housing a drive shaft journalled in said member,manually controlled governor means for regulating the speed of themotor, engaging means having radially disposed engaging faces by whichthe motor engages and disengages the drive shaft, and means for stoppingthe motor independently of the said governor means when the drive shaftand said supporting members are raised a predetermined height, andreleasable means for holding said engaging means in operation and thestopping means out of operation at will.

2. In amixing device having acontainer and means for supporting adriven'means removably in the container, a power unit comprising ahousing and anvarmature shaft exposed at one end of the housing,manually controlled governor means for regulating the speed of themotor, means by which the armature shaft engages and disengages thedriven means in'driving relationship, and means for stopping the motorindependently of said governor means when the drive between the powerunit and driven means is disengaged, and releasable means for lockingsaid engaging means in operation and holding the stopping means out ofoperation at will.

3. In combination a motor casing, a motor with a vertically disposedshaft, a selfaligning bearing supported in the upper part of the casingand supporting the upper end of the shaft, a selfaligning bearingsupporting the bottom of the shaft, a speed governor operated from theshaft, a gear housing mounted upon the casing, a disengageable universaljoint between the shaft and the housing, and means for adjustingtheshaft axiallylto normalize the governor and provide adequateclearance at the universal joint to allow for misalignment undermanufacturing tolerances between 4the shafts connected by the joint.

4. An electrical motor comprising a' housing closed at one end andhaving a central jacket for housing the motor shaft and associatedparts, the walls of the vhousing extending laterally to provide anauxiliary chamber outside of the central jacket except at said one endfor providing and auxiliary chamber, and structural fin means 2,372,862connecting the jacket with the walls to provide supporting means for thejacket and cooling elements disposed in the path of said air, the intakeand outlet for said passage being located at the same ends of thehousing.

5. An electrical motor comprising a housing closed at one end and havinga central chamber for housing the motor shaft and associated parts, `thewalls of the housing extending laterally to provide an auxiliary chamberseparated from the central chamber except at said one end of the housingfor providing a passageway for air through said central and auxiliarychambers, and means driven by the motor for propelling air through saidpassageway. Y

6. In a mixing device having a container and a driven means carried inthe container, a power -unit for driving said means comprising anarmature, a housing joui-nailing one end of the armature, a supportengageable on the housing for journalling the driven means in drivenrelationship with the armature. shaft, a manually controlled governormeans for varying the speed of the power unit, a switch controlledautomaticaliy when the power unit and the driven means are connected forstarting and stopping the power unit without varying the setting of thegovernor, and manually actuated means for securing the driven means inplace and the switch closed.

7. In a mixing device having a driven shaft and support for the shaft,an electric motor for driving the shaft comprising a housing pivotallymounting the support to place the shaft in driven relationship withrespect to the motor, a manually controlled means for varying the speedof the motor including a centrifugal governor, a switch in circuit withthe motor and controlled automatically by the weight of the support whenthe drive between the motor and the shaft is eilected for starting andstopping the motor without varying the setting of the manuallycontrolled means and the speed at which the governor is effective tocontrol the speed, and manually actuated means for securing the supportin place to hold the shaft in place with the switch closed.

8. A power unit for a food mixer comprising a housing open at one end, abearing support at the other end of the housing, a cylindrical walladjacent said bearing support spaced from the housing and secured to thehousing by integral fins providing longitudinal passageways between thehousing and wall, said cylindrical wall providing a compartmentcentrally of the housing, means for connecting the passageways at oneend to said compartment, a stator mounted in the compartment, anarmature journalled at one end in the bearing and having a fan formoving cooling air through said passageways, a spider secured to thehousing at the open end and journalling the other end of the armature, abrush carrier, means for supportingl the spider, housing and carrier inspaced relation including elongated elements receiving spacer sleevesthereon, and air deflecting means separating the air flowing throughsaid passageways from air flowing through said compartment at said openends of the housing.

9. A power 'unit for food mixers having a support, said power unitcomprising a stator for an electric motor, an armature disposed in saidstator, means for journalling one end` of the armature, means at theother end for journalling the other end of the armature, means disposedin spaced relation to each other for supporting the stator upon thesupport and in spaced relation with respect to said journalling meansincluding bolts extending through the stator and spacer sleeves betweenthe stator and support, a unitary brush holder held in. place by saidsupporting means, and means for circulating air over the outside andinside of said stator for cooling same.

10. A power unit for food mixers comprising a stator, an armaturedisposed in said stator, members for journalling the armature at bothends, means for securing the members, and stator in-spaced relationincluding sleeves and bolts extending through the sleeves and stator, aunitary brush holder mounted upon the bolts and held in place by thesleeves, centrifugally responsive governor means upon the armature, andmeans carried by said holder to cooperate with said governor meansincluding a manually controlled member.

1l. A combined governor and brush unit for a motor comprising a mountingplate, brush holders mounted upon one side thereof, an arm mounted uponthe other side of the plate and adapted to be moved in relation to thespeed of the motor, a second arm mounted upon the plate and adapted tobe moved manually, and insulated contacts carried by said arms.

12. In a device of the class described, a motor casing having avertically disposed shaft, a self aligning bearing supported in theupper part of the casing and journalling the upper end of the shaft, aspeed governor operated from the shaft, means on the upper end of thecasing for interchangeably supporting housings each one of which`journals a driven shaft, a disengageable universal joint capable ofvbeing established between the vertical shaft and the shaft journalled bythe housing supported on the casing, and means for journalling the lowerend of the vertical shaft including an adjusting element to normalizethe governor and provide adequate clearances at the universal joint toallow for misalignment under manufacturing tolerances between the shaftsconnected by the joint.

13. In a device of the class described, a casing,

a motor drive shaft journalled in said casing,

said shaft being exposed at one end of the casing, a speed governoroperated from the shaft, means upon the casing where the shaft isexposed for supporting any one of a plurality of housingsinterchangeably, a driven shaft ,iournalled in each housing, an elementupon the drive shaft, an element upon each of the driven shafts capableof mating with the element upon the drive shaft to provide adisengageable universal joint, and means for normalizing the governorincluding an end thrust adjustment which provides adequate clearance atthe make up of the universal joint to allow for misalignment undermanufacturing tolerances between the shafts connected by the joint.

14. In a device of the class described, a casing, a series woundfractional horsepower motor in said casing having one end of thearmature shaft exposed at one end of the casing, a centrifugallyactuated speed governor driven from the shaft including a circuitinterruptor switch in the motor circuit, means upon the casing where theshaft is exposed for supporting interchangeably in weight Abearingrelationship any one of a plu rality of housings having a driven shaftjour nailed therein, elements on said armature shaft and driven shaftengaging each other to provide a disengageable universal joint when saidhousing is located upon the casing, means for normalizing the governorincluding an element adjusting the position of the amature to provideadequate operative clearances between the cooperating elements, andmeans controlled by said housing for stopping the motor automaticallywhen said elements are disengaged.

15. A food mixer comprising a base. a motor casing at one end of thebase, a transsion housing overhansing' the base and having a drivenshaft `ioed therein, an armature shaft journalled in said motor casingat the end proximate to the transmission, means for pivotally mountingthe tr Y '.f. on housing with respect to the base to dispose said shaftssubstantially in u. an interengaging driving means between said drivenshaft and drive shaft including male and female elements detachabl.engaging one another, and means for w.

16. In a food mixer having an elongated base, a power unit locateddirectly upon the base at one end thereof including a motor housingadapted to support a driven device, a motor in the housing having avertically disposed annature shaft journalled in the housing and exposedat the upper end, a centrifugal speed governor operated by the shaft,means upon the armature shaft for driving said driven device inreleasable drive relationship, means for adjusting the governor toregulate the speed of the armature shaft including a handle located uponthe side of the housing for regulating the setting of the governor andmanual switch means for controlling the motor.

ALFRED STRAUSS.

ERIC G. FEL.

MEL

WATSON D. BAUGH.

